Exam

Reviews:
 * Unit 1: [[file:Astronomy Review (SEM II 2012-13).pdf]]
 * Unit 2: [[file:Planetary Science Review (SEMII 2012-2013.pdf]]
 * Unit 3:
 * Unit 4:

**Earth Materials Review**:
- rock cycle diagram - what is a mineral (5 criteria) - relationship between crystal size and depth of formation/temperature - intrusive vs. extrusive rock